Update dependencies for krb5 external test
Dejagnu/TCL are no longer needed. Installing kdcproxy enables krb5's
proxying tests, which exercise the krb5 TLS integration.
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15850)